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Thread: .45 Colt and IMR 4227 rifle loads

  1. #1
    Boolit Master rondog's Avatar
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    .45 Colt and IMR 4227 rifle loads

    Using Lee 255gr LFN's, powdercoated, I've had good luck with 21gr of IMR40227 in my 24" Rossi 92 rifle. But now I have a 30" Uberti 1873 and am wondering if I need a hotter load for the longer barrel, or a weaker load, or what.

    Any advice? I want to use the hottest loads I can, to reach the steel plates that are waaaay out there.

  2. #2
    Boolit Master

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    73's aren't known for their strength like the 92s. I'd stick with Colt loads until someone says otherwise.

  3. #3
    Boolit Master
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    Personally, I wouldn't go above 20 grains in a Model 73.

    Don
    NRA Certified Metallic Cartridge Reloading Instructor

  4. #4
    Boolit Master
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    IMR suggests 17.7gr of 4227 at 14k CUP for a 250gr lead bullet in .45 Colt.

    Don
    NRA Certified Metallic Cartridge Reloading Instructor

  5. #5
    Boolit Bub
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    Brian Pierce , a few yrs ago did an article in Handloader mag on the 45 Colt . Now this was written using the RCBS 270swc , not a 255 gr cast bullet . It was broken down into 3 categories . In cat 1 (14K psi) , he had no 4227 loads . In cat2 (20K psi) he had a max charge of 20. / 4227 . In cat 3 (32K psi) he had a minimum of 22grs and a max of 24grs of IMR 4227 . Regards, Paul

  6. #6
    Boolit Master Jedman's Avatar
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    I use I 4227 in my 45 Colt rifles and believe it's one of the best powders as you don't need to load it to maximum pressures to get it to burn well or give good accuracy.
    In the 1873 I would stay near the 14 K loads give or take a grain or two whatever gives you the best accuracy.

    Jedman

  7. #7
    Boolit Master rondog's Avatar
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    I fired several that had that bullet over 6.5 gr of Titegroup, and wasn't impressed with them. They hit the ground far short of the 200 yard target. Thought I'd brought a box of the 21gr loads, but it turned out to be a box full of fired cases. But I'll definitely heed the advice here!

  8. #8
    Boolit Buddy Win94ae's Avatar
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    Hot loads are not needed to shoot "way out there." I have hit 350 yard targets with my 686. If you're hitting low, aim higher.

  9. #9
    Boolit Master
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    Quote Originally Posted by Win94ae View Post
    Hot loads are not needed to shoot "way out there." I have hit 350 yard targets with my 686. If you're hitting low, aim higher.

    That quote can double as life advice as well.

  10. #10
    Boolit Master


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    The '73 is the last action I'd want to hotrod.

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Abbreviations used in Reloading

BP Bronze Point IMR Improved Military Rifle PTD Pointed
BR Bench Rest M Magnum RN Round Nose
BT Boat Tail PL Power-Lokt SP Soft Point
C Compressed Charge PR Primer SPCL Soft Point "Core-Lokt"
HP Hollow Point PSPCL Pointed Soft Point "Core Lokt" C.O.L. Cartridge Overall Length
PSP Pointed Soft Point Spz Spitzer Point SBT Spitzer Boat Tail
LRN Lead Round Nose LWC Lead Wad Cutter LSWC Lead Semi Wad Cutter
GC Gas Check